- Created complete domain layer with pure business logic - Implemented Issue domain models with 48 passing tests - Implemented Project domain models with 31 passing tests - Added domain services for complex business operations - Established clean separation between domain, application, and infrastructure - All 250 tests passing with no breaking changes 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>